Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d83ab681bebf5c…

MALICIOUS

PDF

79.4 KB Created: 2021-08-21 02:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a62e3eaca14b68839b5d165b31bd74bc SHA-1: 22ed5afa7d49f5828c4292f17443c5861b0dafdf SHA-256: a1d83ab681bebf5cb6a53ed79492e418e12d8ff50c7c40ae1f4f8dbe8986d2e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm designed to manipulate search engine results. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://confetti-seasons.ru/upload/files/wabelesur.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289bc79120---81248272282.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/xanobije.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161104e235dbdd---rafosidilubisimuf.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/jodivug.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/bepamedaxadajepulog.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a249c0472a0---dovumaxusogivupopabulitu.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/jarigodimulidadanepi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4db7e457f---galifat.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/ketosiwisugo.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/fezixulajikaf.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9sao9f8arrshn833upk5bpe924/77372176911.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/96892579068.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d611204ca---faduxosadiwubalizugis.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/72499895845.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210809003432.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/71474660580.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/polotod.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/49257957711.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/vokibimikevo.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/83835683100.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16083b979df6c9---josasenotuwijerule.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/koxejudepalidokoni.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/64790214998.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/xitusigakodareza.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8hlf9jaj2eq0s0gh5klob3hr7/38299608930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=binomische+formeln+aufgaben+mit+l%C3%B6sungen+klasse+8PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBE 17552 bytes
SHA-256: cded08fb563179bd23bd968f831416fee81caca157dcbdea3df1a6d70917d7a7
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 11592 bytes
SHA-256: 62bbf5f62af5e389d6e0e6c1f23500dc17f5fc0a60a3a93da1b56dcfca8ae10b

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